Adam and Brianna plan to install a new tile floor in a classroom. Adam works at a constant rate of 50 tiles per hour, and Brianna works at a constant rate of 55 tiles per hour. If the new floor consists of exactly 1400 tiles, how long will it take Adam and Brianna working together to complete the classroom floor?
A)26 hrs. 44 mins.
B)26 hrs. 40 mins.
C)13 hrs. 20 mins.
D)13 hrs. 18 mins.
E)12 hrs. 45 mins.
OAC
i was doing like below:
Adam 1 tile =1/50
Briana 1 tile =1/55
(Adam+Briana) 1 tile = 1/50+1/55 = 21/550
for 1400 tile = 1400*550/21
where i am wrong in this?
A)26 hrs. 44 mins.
B)26 hrs. 40 mins.
C)13 hrs. 20 mins.
D)13 hrs. 18 mins.
E)12 hrs. 45 mins.
OAC
i was doing like below:
Adam 1 tile =1/50
Briana 1 tile =1/55
(Adam+Briana) 1 tile = 1/50+1/55 = 21/550
for 1400 tile = 1400*550/21
where i am wrong in this?
